As the car pulls into an underground parking garage, you can see that it's late at night. The driver finds a spot and switches off the engine, turning to face you once more. "Well, here we are," he says cheerfully. "I have one last task for you before we part ways."

He hands you a key, carefully avoiding eye contact. "This opens the briefcase in the front seat. There's something important inside that I need you to take care of."

The driver nods and starts walking away. You step out of the car, feeling a bit disoriented after sitting in one place for so long. As you start to follow him, your eyes land on a small, green key fob hanging from the rearview mirror. It seems to be glowing faintly. Curiosity gets the better of you, and you reach up to touch it. The key is cool to the touch, and you notice a tiny LED light flashing at intervals.